The statement tracking was given the same buffer multiple times when a
large packet was spread across multiple buffers when a router with
RCAP_TYPE_STMT_INPUT was present.
The command tracking packet processing is redundant for routers that
require RCAP_TYPE_STMT as the same processing is done later when the
buffer is split into packets and routed. By using the split packets, the
protocol module can simplify the command tracking by a great deal for most
routers.
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